The majority of fry you throw in there are toast no matter what. You will merely be feeding the established predatory fish. Defenseless, disoriented baitfish fry last about two or three days. They won't have time to get hungry. If the crawdads are new at first the fish might not know what they are. I planted several batches, 50 at a time. They did manage to take, and I especially looked for egg carrying females. But they need cover, rock crevices, holes, something. They really thrive on rip rap banks. I have a spillway with stacked pond rocks, they do well there also.
